sftp: Include stdint.h

Thanks to Apex Liu

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit a30d542207)

src/sftp.c

@@ -31,7 +31,7 @@
 #include <ctype.h>
 #include <fcntl.h>
 #include <stdio.h>
-#include <stdio.h>
+#include <stdint.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <limits.h>